Test file with knitr chunk in beamer

This file fails to compile starting with ed62816e.

autotests/export/latex/lyxbugs/ed62816e-knitr-comment-beamer.lyx

@@ -0,0 +1,179 @@
+#LyX 2.5 created this file. For more info see https://www.lyx.org/
+\lyxformat 620
+\begin_document
+\begin_header
+\save_transient_properties true
+\origin unavailable
+\textclass beamer
+\options notheorems
+\use_default_options true
+\begin_modules
+knitr
+\end_modules
+\maintain_unincluded_children no
+\language english
+\language_package default
+\inputencoding utf8
+\fontencoding auto
+\font_roman "default" "default"
+\font_sans "default" "default"
+\font_typewriter "default" "default"
+\font_math "auto" "auto"
+\font_default_family default
+\use_non_tex_fonts false
+\font_sc false
+\font_roman_osf false
+\font_sans_osf false
+\font_typewriter_osf false
+\font_sf_scale 100 100
+\font_tt_scale 100 100
+\use_microtype false
+\use_dash_ligatures true
+\graphics default
+\default_output_format default
+\output_sync 0
+\bibtex_command default
+\index_command default
+\float_placement class
+\float_alignment class
+\paperfontsize default
+\spacing single
+\use_hyperref false
+\papersize default
+\use_geometry true
+\use_package amsmath 1
+\use_package amssymb 1
+\use_package cancel 1
+\use_package esint 1
+\use_package mathdots 1
+\use_package mathtools 1
+\use_package mhchem 1
+\use_package stackrel 1
+\use_package stmaryrd 1
+\use_package undertilde 1
+\cite_engine biblatex-natbib
+\cite_engine_type authoryear
+\biblio_style plain
+\biblio_options maxcitenames=4
+\biblatex_bibstyle authoryear
+\biblatex_citestyle authoryear
+\use_bibtopic false
+\use_indices false
+\paperorientation portrait
+\suppress_date true
+\justification true
+\use_refstyle 1
+\use_formatted_ref 0
+\use_minted 0
+\use_lineno 0
+\index Index
+\shortcut idx
+\color #008000
+\end_index
+\secnumdepth 4
+\tocdepth 3
+\paragraph_separation indent
+\paragraph_indentation default
+\is_math_indent 0
+\math_numbering_side default
+\quotes_style english
+\dynamic_quotes 0
+\papercolumns 1
+\papersides 1
+\paperpagestyle default
+\tablestyle default
+\tracking_changes false
+\output_changes false
+\change_bars false
+\postpone_fragile_content false
+\html_math_output 0
+\html_css_as_file 0
+\html_be_strict false
+\docbook_table_output 0
+\docbook_mathml_prefix 1
+\end_header
+
+\begin_body
+
+\begin_layout Frame
+
+\end_layout
+
+\begin_deeper
+\begin_layout Block
+Recall:
+ 
+\begin_inset Formula $\sigma_{XY}:=E\left[\left(X-\mu_{X}\right)\left(Y-\mu_{y}\right)\right]$
+\end_inset
+
+.
+ 
+\begin_inset Formula $X$
+\end_inset
+
+ is monthly income,
+ measured in $1000's,
+ 
+\begin_inset Formula $Y$
+\end_inset
+
+ is years of education.
+\end_layout
+
+\end_deeper
+\begin_layout Frame
+\begin_inset Flex Chunk
+status open
+
+\begin_layout Plain Layout
+
+\begin_inset Argument 1
+status open
+
+\begin_layout Plain Layout
+
+include = FALSE
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\begin_layout Plain Layout
+
+# create data set...
+\end_layout
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\begin_layout Plain Layout
+
+x <- 3
+\end_layout
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Frame
+blah
+\end_layout
+
+\begin_layout Frame
+
+\end_layout
+
+\end_body
+\end_document